EP0129239B1 - Synthese-Verfahren von ZSM-5-Zeolith bei Umgebungsdruck und niedriger Temperatur - Google Patents

Synthese-Verfahren von ZSM-5-Zeolith bei Umgebungsdruck und niedriger Temperatur Download PDF

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EP0129239B1
EP0129239B1 EP84106970A EP84106970A EP0129239B1 EP 0129239 B1 EP0129239 B1 EP 0129239B1 EP 84106970 A EP84106970 A EP 84106970A EP 84106970 A EP84106970 A EP 84106970A EP 0129239 B1 EP0129239 B1 EP 0129239B1
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aqueous solution
added
molar ratio
sio
compound
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EP0129239A3 (en
EP0129239A2 (de
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Giuseppe Gubitosa
Paola Gherardi
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ECP Enichem Polimeri SRL
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Montedison SpA
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C6/00—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions
    • C07C6/08—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond
    • C07C6/12—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond of exclusively hydrocarbons containing a six-membered aromatic ring
    • C07C6/123—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond of exclusively hydrocarbons containing a six-membered aromatic ring of only one hydrocarbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/36—Pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
    • C01B39/38—Type ZSM-5
    • C01B39/40—Type ZSM-5 using at least one organic template directing agent
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
    • C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
    • C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
    • C07C2/66—Catalytic processes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
    • C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
    • C07C5/27—Rearrangement of carbon atoms in the hydrocarbon skeleton
    • C07C5/2702—Catalytic processes not covered by C07C5/2732 - C07C5/31; Catalytic processes covered by both C07C5/2732 and C07C5/277 simultaneously
    • C07C5/2708—Catalytic processes not covered by C07C5/2732 - C07C5/31; Catalytic processes covered by both C07C5/2732 and C07C5/277 simultaneously with crystalline alumino-silicates, e.g. molecular sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/20—After treatment, characterised by the effect to be obtained to introduce other elements in the catalyst composition comprising the molecular sieve, but not specially in or on the molecular sieve itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/30—After treatment, characterised by the means used
    • B01J2229/37—Acid treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/30—After treatment, characterised by the means used
    • B01J2229/38—Base treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2529/00—Catalysts comprising molecular sieves
    • C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
    • C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • C07C2529/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11

Definitions

  • the invention concerns a method for the synthesis of ZSM-5 zeolite, at atmospheric pressure and at low temperatures.
  • US-A-4,117,026 teaches in particular, that a ZSM-5 zeolite, having a relatively large size (average size ⁇ 0.5 pm and preferably from 1 to 6 ⁇ m), can be very useful in disproportionating toluene to benzene and para-xylene.
  • the same U.S. patent (4,117,026) states however that when relatively low temperatures are used during the zeolite preparation (e.g. 220°F, namely 104°C) said average size is rather low (0.03 pm).
  • the method, according to the invention, for the synthesis of ZSM-5 zeolites at atmospheric pressure and at temperatures from 60 to 100°C comprises the following steps:
  • Said (QA) quaternary compound can be replaced by a mixture of (QA) with an amine, according to the teachings of EP-A-101183.
  • Figure 1 graphically represents the critical triangles mentioned above, said triangles being one of the features of the invention, and figure 2 represents a narrower area, corresponding to a particularly preferred embodiment of the invention.
  • the present invention comprises all those equivalent embodiments that do not misrepresent the gist of the invention; e.g. the AI sulphate can be replaced by equivalent amounts of another salt (for instance nitrate) and H 2 SO 4 can be replaced by equivalent amounts of another acid supplier of H 3 O + ions, e.g. HNO 3 or H 3 PO 4 .
  • the calculation of the OH - ions depends on the selected salt and acid; if the salt is AI sulphate and the acid H 2 SO 4 , the formula is (by moles):
  • the extension of the floculation depends on the amount of added Al.
  • the acid e.g.
  • H 2 S0 4 is added in such an amount as to obtain a more or less thick gel; best results are achieved when the amounts of acid decrease (**) with increasing amounts of AI.
  • the crystallization time preferably under agitation is 3 days, according to the examples, but it is possible to obtain rather good results also within shorter periods of time. (*) approximately with exponential trend. (**) within the boundaries of the figure 1 triangles.
  • the zeolites obtained according to the invention can be used (as such or in a modified form) in admixture with suitable amounts of oxides as binders, e.g. Si0 2 or A1 2 0 3 ; a list of many other binders can be found e.g. in EP-A-36707.
  • binders e.g. Si0 2 or A1 2 0 3 ; a list of many other binders can be found e.g. in EP-A-36707.
  • the regeneration of the catalyst can be carried out in air for a few hours at 30a-600°C; a steam regeneration is described in EP-A-36704 and according to a still further method the catalyst can be regenerated by a hydrogen treatment.
  • the acid form of the zeolites can be very advantageously obtained when the crude product of the zeolite synthesis is dried (e.g. at 120°C), calcined (e.g. at 540°C in air for a few hours), so as to remove any residual organic compound, and then exchanged with a solution containing HCI or NH 4 N0 3 ; in the second case (NH 4 N0 3 ), the final acid form is obtained by means of a heat-treatment, e.g. at 400°C.
  • Other methods for the ion exchange of the zeolites are described, for instance, in US-A-3,140,249; 3,140,251; 3,140,253 and in EP-A-68,754 and 40,276.
  • the zeolites prepared according to the invention show a long life time and a very high catalytic activity in many reactions, particularly in toluene disproportionation, benzene alkylation and the aromatization of olefines; they are furthermore extraordinarily active in the conversion of methanol into any kind of hydrocarbons and particularly into olefinic and aromatic hydrocarbons, especially low molecular weight olefins.
  • the mixture was transferred to a polytetrafluoroethylene flask, equipped with cooler, stirrer and thermometer, and kept at 100°C for 3 days under gentle stirring and reflux; the product was filtered, repeatedly washed with deionized H 2 0, until obtaining a neutral washing liquid (litmus paper) and dried at 120° for 16 hours.
  • the solids yield was 100% and the X-ray analysis showed that the product was a ZSM-5 zeolite having a cristallinity degree of 100% (see Table 1); the composition of the product is listed in Table 1, together with the reaction conditions.
  • Example 1 was repeated while using greater amounts of H 2 S0 4 (respectively 4.00 and 4.50 cm 3 ), whereby the OH-/SiO 2 ratio of Table 1 was modified.
  • the results of examples 1-3 were similar.
  • Example 1 was repeated, while lowering the amount of H 2 SO 4 to 0.76 cm 3 , whereby the value of the OH - /SiO 2 ratio was 0.428, thus obtaining very poor results, as can be deduced from Table 1.
  • Example 1 was repeated while bringing the H 2 S0 4 amount up to 5.90 cm 3 ; worse results were obtained, as shown in Table 1.
  • Example 1 was repeated, while modifying the amount of AI sulphate (0.60 g) and also the amount of H 2 SO 4 (4.65 cm 3 ); data results are given in Table 1.
  • Example 1 was repeated while increasing the amount of AI sulphate to 5.06 g and decreasing the H 2 SO 4 amount down to 3.15 cm 3 ; data and results are given in Table 1.
  • Example 7 was repeated, while leaving the amount of AI sulphate unchanged, but adding respectively 2.00 and 3.65 cm 3 of H 2 S0 4 ; data and results are given in Table 1.
  • Example 2 was repeated while lowering the original amount of (TPA)Br by 50%, namely to 18.60 g; data and satisfactory results are given in Table 2.
  • Example 10 was repeated while adding 4.50 cm 3 of H 2 SO 4 ; data and results are given in Table 2.
  • Example 10 was repeated while doubling the amounts of Si0 2 , NaOH, (TPA)Br, AI sulphate, potassium fluoride and H 2 SO 4 and leaving the amount of H 2 0 unchanged (reduction of the dilution level); data and good results are listed in Table 2.
  • Example 12 was repeated, while adding 9.00 cm 3 of H Z SO 4 ; data and results are given in Table 2.
  • a solution of Na metasilicate prepared by dissolving 31.02 g of NaOH in 200 cm 3 of deionized H 2 0 and by adding 22.80 g of Si0 2 and 10.45 g of KF.2H 2 0, was kept at 100°C until obtaining a clear solution, without any solid matter; after cooling down to room temperature, 18.60 g of (TPA)Br, dissolved in 150 cm 3 of deionized H 2 0, and 2.53 g of Al 2 (SO 4 ) 3 .18H 2 O, dissolved in 100 cm 3 of deionized H 2 0, were added in this order. The gel thus obtained was heated at 80°C and 18.98 cm 3 of H 2 S0 4 were added, drop by drop, under gentle stirring; the further synthesis was carried out as in Example 1. Data and results are given in Table 2.
  • Example 2 The mixture was transferred into a polytetrafluoroethylene flask and kept at 150°C for 3 days under autogenous pressure; the product was then treated as in Example 1. Data and results are given in Table 2, whereform one can take that, after 3 days, the amount of solid (completely in crystalline form) is merely 75% of the theoretical amount; a further test, for a longer period of time, has shown that the 100% solid (crystalline) yield is reached only if the heating (at 150°C and without KF) is extended for a period of 5 days.
  • Example 18 Application of the zeolite catalyst
  • H-ZSM5 prepared according to example 1, was calcined in air at 540°C for 16 h; 20 g of the calcined product were suspended in 400 cm 3 of a 0.5 M solution of NH 4 NO 3 and kept at 80°C for 2 h under gentle stirring. Such treatment was identically repeated 5 times; eventually the product was filtered, washed until negative nitrate test (brucine test) and dried for 16 h at 120°C.
  • H-ZSM5 was decomposed, thereby obtaining H-ZSM5, by means of a calcination in a nitrogen stream, at 540°C for 16 h; 10 g of such H-ZSM5 were admixed with 14 cm 3 of a silica sol (commercially known as "Ketyensol®AKZO", containing 40% b.w. Si0 2 ), dried for 16 h at 120°C, then granulated and finally calcined for 16 h at 540°C.
  • silica sol commercially known as "Ketyensol®AKZO"
  • example 14 was repeated quadruplicating the amount of Si0 2 , NaOH, (TPA)Br, potassium fluoride and AI sulphate, while adding 18.50 cm 3 of H 2 SO 4 and keeping practically unaltered the water volume. Data and results are recorded in Table 5.
  • Example 19 was repeated reducing to 50% the amount of (TPA)Br (15.38 g). Data and results are recorded in Table 5.
  • example 20 was repeated multiplying by 8 all the amounts of the reactants provided for by said example 20. Data and results are recorded in Table 5.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
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Claims (9)

1. Verfahren zur Herstellung von ZSM-5-Zeoliten bei atmosphärischem Druck und bei einer Temperatur von 60 bis 100°C, bei welchem
a) eine wässrige Lösung, die eine quaternäre Ammoniumverbindung (QA) enthält, zu einer zweiten wassrigen Lösung, die eine Si-Verbindung, eine Na-Verbindung und ein Kaliumhalogenid (KHal) entsprechend den molaren Verhältnissen
- Na20/Si02 ≥0,20 (vorzugsweise von 0,25 bis 2),
- H20/Si04 = von 5 bis 100
- KHal/Si02 = von 0,03 bis 0,50 enthält, zugeführt wird,
b) eine dritte wässrige Lösung, die AI-Sulfat oder eine äquivalente Menge eines anderen Al-Salzes (z.B. Al-Nitrat) ethält, zu der gemäß a) erhaltenen Mischung zugefügt wird,
c) zu der gemäß b) erhaltenen Mischung eine wässrige Lösung von H2S04 oder einer äquivalenten Menge einer monoprotischen Säure (z.B. HN03) oder einer polyprotischen Säure (z.B. H3P04) zugefügt wird, und bei welchem das molare Verhältnis Y = (QA/Si02) von 0,02 bis 0,08 liegt und das molare Verhältnis Z = Si02/AI203 von 25 bis 422 liegt, wobei das Y-Verhältnis und das molare Verhältnis X = OH-/SiO2 dargestellt wird durch Punkte, die innerhalb von Dreiecken liegen, die durch die folgenden drei geraden Linien begrenzt werden:
A) Y = 0,7 X,
B) X = K/Z, worin K = 4 ist (und K konstant ist),
C) Y = -2/3 X + 1 - H, worin die Konstante H erhalten wird aus der Gleichung: H = 1/2 (45/Z)0,317.
2. Verfahren zur Herstellung von ZSM-5-Zeoliten bei atmosphärischem Druck und bei einer Temperatur von 60 bis 100°C, bei welchem
a) eine wässrige Lösung, enthaltend eine quaternäre Ammoniumverbindung (QA), enthaltend zu einer zweiten wässrigen Lösung, eine Si-Verbindung, eine Na-Verbindung und ein Kaliumhalogenid (KHal) entsprechend den molaren Verhältnissen:
- Na20/Si02 ≥0,20 (vorzugsweise von 0,25 bis 2),
- H20/Si02 = von 5 bis 100,
- KHal/Si02 = von 0,03 bis 0,50, zugeführt wird,
b) eine dritte wässrige Lösung, enthaltend Al-Sulfat oder eine äquivalente Menge eines anderen AI-Salzes (z.B. Al-Nitrat), zu der gemäß a) erhaltenen Mischung zugefügt wird,
c) zu der gemäß a) erhaltenen Mischung eine wässrige Lösung von H2S04 oder einer äquivalenten Menge einer Monoprotischen Säure (z.B. HN03) oder einer polyprotischen Säuren (z.B. H2P04) zugefügt wird, und bei welchem das molare Verhältnis Y = (GA/Si02) 0,368 beträgt und das molare Verhältnis Z = Si02/ A1203 von 25 bis 422 betragt, wobei das Y-Verhältnis und das molare Verhältnis X = OH-/SiO2 durch Punkte dargestellt wird, die innerhalb von Dreiecken liegen, die durch die folgenden drei geraden Linien begrenzt werden:
A) Y = 0,7 X,
B) X = K/Z, wobei K = 4 ist (und K konstant ist),
C) Y = -2/3 X + 1 - H, worin die Konstante H erhalten wird aus der Gleichung: H = 1/2 (45/Z)0,317.
3. Verfahren zur Herstellung von ZSM-5-Zeoliten bei atmosphärischem Druck und bei einer Temperatur von 60 bis 100°C, bei welchem
a) eine wässrige Lösung, enthaltend eine quaternäre Ammoniumverbindung (QA), zu einer zweiten wässrigen Lösung, enthaltend eine Si-Verbindung, eine Na-Verbindung und ein Kaliumhalogenid (KHal) gemäß den molaren Verhältnissen
- Na20/Si02 ≥0,20 (vorzugsweise von 0,25 bis 2),
- H20/Si02 = von 5 bis 100,
- KHal/Si02 = von 0,03 bis 0,50, zugeführt wird,
b) eine dritte wässrige Lösung, enthaltend Al-Sulfat oder eine äquivalente Menge eines anderen AI-Salzes (z.B. AI-Nitrat), zu der gemäß a) erhaltenen Mischung zugefügt wird,
c) zu der gemäß b) erhaltenen Mischung eine wässrige Lösung von H2S04 oder einer äquivalenten Menge einer Monoprotischen Säure (z.B. HN03) oder einer polyprotischen Säure (z.B. H3PO4) zugefügt wird, und bei welchem das molare Verhältnis X = (QA/Si02) 0,184 beträgt und das molare Verhältnis Z = Si02/ Al2O3 von 25 bis 422 beträgt, wobei das Y-Verhältnis und das molare Verhältnis X = OH-/SiO2 durch Punkte dargestellt wird, die innerhalb von Dreiecken liegen, die durch die folgenden drei geraden Linien bengrenzt werden:
A) Y = 0,7 X,
B) X = K/Z, worin K = 4 ist (und K konstant ist),
C) Y = -2/3 X + 1 - H, worin die Konstante H erhalten wird aus der Gleichung: H = 1/2 (45/Z)0,317.
4. Verfahren zur Herstellung von ZSM-5-Zeoliten bei atmosphärischem Druck und bei einer Temperatur von 60 bis 100°C, bei welchem
a) eine wässrige Lösung, enthaltend eine quaternäre Ammoniumverbindung (QA), zu einer zweiten wassrigen Lösung, enthaltend eine Si-Verbindung, eine Na-Verbindung und ein Kaliumhalogenid (KHai) gemäß den molaren Verhältnissen
- Na20/Si02 ≥0,20 (vorzugsweise von 0,25 bis 2),
- H20/Si04 = von 5 bis 100,
- KHal/Si02 = von 0,03 bis 0,50, zugeführt wird,
b) eine dritte wässrige Lösung, enthaltend Al-Sulfat oder eine äquivalente Menge eines anderen AI-Salzes (z.B. Al-Nitrat), zu der gemäß a) erhaltenen Mischung zugefügt wird,
c) zu der gemäß b) erhaltenen Mischung eine wässrige Lösung von H2SO4 oder einer äquivalenten Menge einer monoprotischen Säure (z.B. HN03) oder einer polyprotischen Säure (z.B. H2PO4) zugefügt wird, und bei welchem das molare Verhältnis Y = (QA/Si02) 0,02 bis 0,08 beträgt und das molare Verhältnis Z = SiO2/Al2O3 von 25 bis 422 beträgt und das molare Verhältnis X = OH-/SiO2 gleich 0,062 ist.
5. Verfahren nach irgendeinem der Ansprüche 1 bis 4, worin Z von 25 bis 210 ist.
6. Verfahren nach irgendeinem der Ansprüche 1 bis 5, worin die gesamte Verdünnung, nämlich das molare Verhältnis von "gesamtem H2O"/SiO2, von 7 bis 120 (vorzugsweise von 15 bis 80) beträgt.
7. Verfahren nach irgendeinem der Ansprüche 1 bis 5, worin das Kaliumhalogenid ausgewählt ist aus der Gruppe, die Kaliumchlorid und Kaliumfluorid umfaßt.
8. Die Verwendung von Zeoliten, erhalten nach dem Verfahren der Ansprüche 1 bis 7, für eine säurekatalysierte Reaktion, insbesondere zur Xylolisomerisation, zur Toluoldisproportionierung und zur Benzolalkylierung.
9. Die Verwendung von Zeoliten, erhalten nach dem Verfahren der Ansprüche 1 bis 7, zur Methanolumwandlung in leichte Olefine und insbesondere in Propylen.
EP84106970A 1983-06-21 1984-06-18 Synthese-Verfahren von ZSM-5-Zeolith bei Umgebungsdruck und niedriger Temperatur Expired EP0129239B1 (de)

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IT21699/83A IT1205303B (it) 1983-06-21 1983-06-21 Metodo per la sintesi di zeoliti di tipo zsm-5 a pressione atmosferica
IT2169983 1983-06-21

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EP0129239A2 EP0129239A2 (de) 1984-12-27
EP0129239A3 EP0129239A3 (en) 1985-08-28
EP0129239B1 true EP0129239B1 (de) 1989-01-11

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DE19707994A1 (de) * 1997-02-27 1998-09-03 Sued Chemie Ag Verfahren zur Herstellung von Zeolithen mit einem hohen Si/Al-Atomverhältnis
TW526172B (en) * 1999-06-30 2003-04-01 Sumitomo Chemical Co A process for producing pentacyl-type crystalline zeolites and a process for producing ε-caprolactam using the same
US20120142990A1 (en) * 2009-05-19 2012-06-07 Leslie Andrew Chewter procress for the preparation of an olefinic product, process for the manufacture of an oxygenate conversion catalyst and an oxygenate conversion catalyst
MX2015002948A (es) 2012-09-07 2015-06-02 Paben Proyectos Estrategicos S A De C V Estructurantes basados en silice y procesos para hacer los mismos.
CN108970636B (zh) * 2018-06-27 2021-01-05 大连理工大学 一种苯烷基化催化剂的制备方法

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EP0129239A3 (en) 1985-08-28
IT1205303B (it) 1989-03-15
IT8321699A0 (it) 1983-06-21
EP0129239A2 (de) 1984-12-27
DE3476060D1 (en) 1989-02-16

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